Search found 1559 matches

by fredrosse
Sun Mar 24, 2019 4:21 am
Forum: Technical - non Engines and Boilers
Topic: Boiler feed pump ?
Replies: 16
Views: 271

Re: Boiler feed pump ?

I have made very reliable feed pumps from common brass pipe fittings with two common swing type check valves. The interior bore of brass pipe is so smooth that no further finishing is needed, and a piston machined from brass bar stock has worked well, with a couple thousanths of an inch clearence in...
by fredrosse
Sun Mar 24, 2019 3:45 am
Forum: Welcome
Topic: Hello from Massachusetts!
Replies: 29
Views: 851

Re: Hello from Massachusetts!

A 150 psi steam rated sight glass, setup with proper valves and floating ball automatic stops (stops steam/water flow in case of glass breakage) cost about $150. How much does a reflex setup cost? Two methods of detecting boiler water level should be provided on all steam boilers. Usually a visual l...
by fredrosse
Sun Mar 24, 2019 3:40 am
Forum: Welcome
Topic: Hello from Massachusetts!
Replies: 29
Views: 851

Re: Hello from Massachusetts!

Much better than stainless steel for piston and valve packed rods is hardened ground and chromed piston rods from common pneumatic cylinders. I get them from Ebay for very reasonable prices, but you have to look up the rod details from the cylinder manufacturer catalogue. I have a 5/8 inch diameter ...
by fredrosse
Sat Feb 09, 2019 12:36 pm
Forum: General Steamboat stuff
Topic: Marina Difficulties?
Replies: 3
Views: 837

Re: Marina Difficulties?

In salt/brackish water I need to fill my 15 gallon water tank with drinking water about every 2 hours. I usually just come into any marina and use their water hose to fill my tanks. Have always been welcomed, and no mention about fire concerns. With propane firing and the VFT I can turn the fire off...
by fredrosse
Fri Feb 01, 2019 12:55 am
Forum: Technical - Engines and Boilers
Topic: What water speed do you work with in monotube boilers?
Replies: 5
Views: 301

Re: What water speed do you work with in monotube boilers?

https://images2.imgbox.com/f2/ea/Ied2PJxI_o.jpeg Flow regimes for two phase liquid & gas flows, considerably more complicated than single phase flows. When water begins to have steam in the lines, then velocities increase rapidly, and usually a homogeneous mixture model is the acceptable character....
by fredrosse
Fri Feb 01, 2019 12:06 am
Forum: Technical - Engines and Boilers
Topic: What water speed do you work with in monotube boilers?
Replies: 5
Views: 301

Re: What water speed do you work with in monotube boilers?

Having practiced as a fluid systems engineer for over 50 years, I can state that laminar flow virtually does not exist in water/steam systems. The only places where laminar flow is of interest in my experience is with high viscosity lubricating oils under gravity flow, and the cooling flow for elect...
by fredrosse
Wed Jan 30, 2019 2:19 am
Forum: Technical - Engines and Boilers
Topic: Ideas to fasten gear wheels to shafts
Replies: 6
Views: 388

Re: Ideas to fasten gear wheels to shafts

I have used "Po-Boy" keys many times, with great success. A tap drill is used, drilling parallel to the shaft centerline at the intersection of the shaft outside diameter and the driven component inside diameter. Tap deep enough for two set screws, run the first one down hard, followed by the second...
by fredrosse
Mon Jan 21, 2019 5:42 pm
Forum: Technical - Engines and Boilers
Topic: Con-rods and length
Replies: 28
Views: 848

Re: Con-rods and length

Stress relieving of weldments that become a part of machinery is almost always required if precision is a requirement. When welding, a portion of the steel becomes liquid, and adjacent areas become butter weak. Then the material solidifies, still very hot. Then the material cools further, shrinking ...
by fredrosse
Sat Jan 19, 2019 11:20 pm
Forum: Technical - Engines and Boilers
Topic: Opposed Piston Engine Project - The Steam Version
Replies: 22
Views: 1048

Re: Opposed Piston Engine Project - The Steam Version

Designing a new steam engine is a significant task, with much research and engineering required. I wish you good luck in your endeavor. As far as the expressed difficulties associated with high compression in uniflow engines, it is true that they give less constant torque impulses than conventional ...
by fredrosse
Tue Jan 01, 2019 3:47 am
Forum: Technical - Engines and Boilers
Topic: Condensing Circuit Logic
Replies: 17
Views: 819

Re: Condensing Circuit Logic

In larger power plants a common efficiency goal is to keep the condensate temperature as close as possible to the saturation temperature corresponding to the condenser pressure, be it whatever prevailing vacuum. In large sea water cooled condensers, the tube bundle may be on the order of 20ft x 20ft...